Add release note for thin provisioning
Change-Id: I96f543875def15587973e30c21eb6df1451b7d86
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---
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features:
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The seven LVM volumes in the overcloud-hardened-uefi-full image are now
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thinly provisioned, backed by a single pool. The initial boot growvols
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behaviour is now to grow the pool to the size of the disk and grow each
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thin provisioned volume so the capacity of the pool is filled but not over
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provisioned. This will allow temporary volumes to be created for backups
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during upgrades, and it will allow the operator to over-provision a volume
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which requires extra capacity.
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